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The US Gauge TW-4GUHD thermowell is available in heavy duty with a 4" stem. The TW-4GUHD standard process connection sizes are 1/2"-14 NPT, 3/4"-14 NPT and 1"-11-1/2" NPT.
Lengths | ±1/16" on lengths 12" or less; ±1/8" on lengths 12" or over |
Wells 30" and Over | Solid bored type will be drilled thru end, plugged, and heli-arc welded; built-up design must be specified beyond 42-1/4" overall length |
OD Tolerances | Fractional: ±.015; Decimal: ±.005 on .000 place; ±.01 on .00 place |
Bore ID | +.005; -.003; usually within ±.002 |
End Thickness | Gun drill bottom; 1/4" to bottom ±1/16"; 3/16" minimum end thickness |
Concentricity of Bore to OD | ±10% of minimum wall thickness |
Wetted Surfaces Finish | Standard finish 60-100 Ra; 16-32 Ra available; 4-10 Ra mirror polish available |
Radius Under Threads and Flanges | 1/8" is standard, ±1/16".; 1/16" on Van Stone type |
Male Threads (NPT) | ±1 turn on thread gage |
Female Threads | 1/2" NPSM standard; 1/2"-14 NPT available upon request; go gauge to 5/8" depth of thread; GO/NOGO gauge 2 turns maximum |
End of Wells | Break corners; no burrs |
Lagging Ext. | On screwed wells; left as hex stock (not turned); exception – when hex is not available in special materials |
Stamping | Stamped onto hex or round facing open end of well; material code identification; tag numbers |
Flanged Wells | Made in accordance with ANSI B16.5; raised face is serrated 125 Ra; smooth face must be specified on order if needed |
Front J | Groove welds are 1/4" wide by 1/4" deep; welds are machined, leaving 1/8" radius; rear welds are 1/8" wide by 1/8" deep V; welds are machined, leaving 1/4" radius; full penetration welds are available upon request and must be specified |
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